/int/ 36504896: Why do humans generally give birth to only one offsprin...

Why do humans generally give birth to only one offspring? Why don't they give birth to litters like animals? Isn't it more effective for survival of the genes to produce many babbys from one pregnancy?

>Isn't it more effective for survival of the genes to produce many babbys from one pregnancy? It isn't even properly defined what survival means or "success". Evolutionary theory isn't about that either, it's about explaining certain observations. Everything else is tainted by human subjective perspective.